[DML] Re: Odd chatter from brakes *update*

["Harold McElraft" <hmcelraft@xxxxxxx>]

If the noise is deceleration noise as Dave T suggests I would also 
expect it to occur when you rev the motor. When you run the motor up 
to 3-4,000 RPM and let off the gas you would hear the noise.

If the noise stops when you disengage the clutch then I would look 
for something in the drive line or motor mounts. I suggest applying 
the parking brake and investigating the movement of the motor and 
trans assembly with the car in reverse. This should simulate to some 
extent deceleration in gear. With the car running, gently start to 
engage the clutch first in reverse then in first gear. Repeat 
several times and observe the movement of the engine. This will be 
hard to observe alone and usually takes more than one person to do.

I'm focused on drive line because the deceleration valves sticking 
are very rare.

Another thing occurred to me. I once had the muffler brace above the 
alternator break. The broken piece was still on the muffler mount 
and because of the rust, etc. on the brace, the broken piece would 
move but only with some force. When I slowed the car it would move 
forward and hit the alternator fan blades and cause all kinds of 
racket. When I took off the noise went away. I looked right at the 
broken piece several times before I realized it was broken and 
discovered the source of the noise.

Harold McElraft - 3354



--- In dmcnews@xxxxxxxxxxxxxxx, "Payne" <bpayne@xxxx> wrote:
> 
> 
> 
> > Doesn't sound like the brakes. Did you check for a broken motor
> > mount or bad CV joint?
> >
> > Harold McElraft - 3354
> >
> 
> I thought about the CV joints as the noise is similar, but 
shouldn't it make
> the noise all the time, whether the engine is off or not?  I can 
brake as
> hard as I want while coasting with the engine dead and it will not 
make the
> noise, but if I have the engine running it makes the horrible 
racket every
> time I hit the brakes.
> 
> I am going to take David Teitelbaum's suggestion about the 
deceleration
> valves on the throttle plates. If this is the problem, then why 
does braking
> affect it? Like I said, I have limited knowledge in this area so I 
really
> appreciate everyone helping me understand.
> 
> The car is also a daily driver and has certainly been driven a lot 
lately.
> Acceleration and braking are fine otherwise, it's weird that this 
started so
> suddenly. Hopefully it's nothing serious, right now it's just 
embarrassing.
> 
> Brandon Payne
> #2975
> 
> 
> ---
> [This E-mail Scanned for viruses by Onlinemac.com]




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